Blast furnace tuyere



J. H. sPRQW BLAST FURNACE TUYERE Filed Eflay 22, 1946 IVENTORI. John H. Sprow A TTUR/VE 5 Patented Nov. 30, 1948 UNITED STATES PATENT OFFICE 42,454,892 BLAST FURNACE TUYERE John H. Sprow, Jackson, Ohio Application May 22,1946, Serial No. 671,481 claims; (c1. 266-41) My invention relates to a blast furance tuyere.

' One of the objects of my invention is to provide a blast furnace tuyre which is of such a nature that it will split the air blast as it enters the tuyre so as to give an equal amount of air to each quarter area of the tuyere and will impart a twist to the air blast as it passes therethrough', thereby, producing a complete stabilizing action on the blast and concentrating the eflect of the blast at the core of the tuyere. This results in a blast of air in the shape of an auger which will have a boring eiiect and, thereby, deeper penetration into the furnace and which will have greater maximum velocity and better velocity concentration at a given distance from the tuyere and results in a more evenly distributed air blast.

Another object of my invention is to provide a blast furnance tuyere of the type indicated above which is of such construction that a bar may be passed therethrough during operation of the "furnace to clean out deposits of cinders which might form in the tuyre or to break up pilasters' if they form inside the furnace adjacent the tuyere.

Otherobjects will be apparent hereinafter.

The preferred embodiment of my invention,

is illustrated in the accompanying drawings wherein: p

Figure 1 is an elevational view of my tuyre taken at the intake end thereof.

' Figure 2 is a longitudinal sectional view taken substantially along line 2-2 of Figure 1.

Figure 3 is a transverse sectional view through the tuyere taken substantially at the location of line 5-33 on Figure 2.

Figure 4 is a perspectiv view of a portion of the tuyere showing the inside thereof.

Figure 5 is a horizontal sectional view taken along line 5-5 of Figure 6 through a blast furnace provided with a series of my tuyeres showing the action of the tuyeres.

Figure 6 is a vertical sectional view line G-t of Figure 5,

With reference to the drawings, I have shown taken along Q my tuyere as comprisin a substantially frustoconical hollow body i. This body i is provided with a surrounding water jacket 2 provided with inlet and outlet openings 3 and t. The body 8 is provided with an axial bore 5 for receiving the air blast and extending entirely therethrough from the inlet end 6 to the nose or outlet end i. The wall or surface of the bore 5 is gradually tapered from the inlet end to the outlet end of the tuyre body i. The inlet end 5 is provided with an outwardly flared suface 8 leading into the bore 5.

thereof through an angle of 45. Furthermore.

At the inlet end of the tuyere body i, I provide a series of integral radially projecting ribs 9 which are spaced clrcumferentially on the surface of the bore 5 at intervals of 909. Each rib 9 includes a straight section! 0 which extends from the inner extremity of flared surface 8 a short distance towards the nose end of the tuyere body I. These straight sections ill have inner edges ii substantially parallel to the longitudinal axis of the tuyere body. Each rib 9 also includes a helicoid section H which extends from the inner end ofstraight section it to a point slightly beyondthe mid-point of the length of the tuyerebody i. The sections it and sections in are in angular relationship. The helicoid sections i2 have one-eighth of a turn from the inner ends of straight sections it) in their inner extremities and, consequently, the inner extremity of each helicoid section I2 is spaced circumferentially on the surface of bore 5 from the outer extremity each of the helicoid sections 92 its own center line.

A second series of integral radially projecting ribs i5 extend from the inner extremities of ribs 9 is twisted about to the nose of the tuyre or outlet end i of the bore 5. These ribs 115 are identical with the ribs t except they are not provided with straight sections corresponding to sections ill of ribs t. They are of helicoid form and have one-eighth of a turn from their inner ends to their outer ends similar to helicoid sections 52. They are also twisted about their own axes like sections it. The helicoid ribs it are not in alignment with sections it but are disposed circumferentially be tween them. The helicoid ribs i 5 are spaced circumierentially from each other on the surface of bore 5 apart but are spaced only 45 from the adjacent helicoid sections it of ribs 9.

In the operation of the tuyre, as shown in Figures 5 and 6, the air blast entering into the inlet end 6 of bore 5 is first split into four sections by the straight sections it of*rlbs- 9, as it is initially being compressed by the taper of'the bore. Thus, the air is divided into four equal parts around the tuyere. It has ashort straight travel before coming into contact with the helicoid sections M of the ribs 8. When the blast does come into contact with thesections i2, it is twisted. The twisting'action is continued and the air blast is further split when it comes into contact with the helicoid ribs it. As the blast leaves the outlet endt of bore 5 and enters the furnace, it is rotated, as illustrated in Figure 5.

Thus, the blast of air is first split into four equal parts and then twisted by the first set of Then it comes into contact with the second which further split it and twist it. This produces a blast which is rotated as it leaves the tuyere and enters the furnace, Due to the helicoid sections of the ribs and also to the fact that they are twisted about their own axes, the air blast will be in the shape of an auger when it enters the furnace and will have a boring efi'ect that gives a deeper penetration into the raw materials of the tuyere zone. By passing through my tuyre the blast is stabilized and concentrated at the core of the tuyere. This not only results ribs. set of ribs in a deeper penetration into the furnace, but

gives greater velocity to the blast, and results in better velocity concentration at a proper distance from the tuyere and in a more evenly distributed air blast. Because the ribs 8 are staggered relatlve to the ribs IS, a clean out bar can be passed through the bore along the surface thereof through the space between the adjacent ribs 9 and 15. Thus, cinders or other deposits can be removed from the wall of bore 5 or pilasters inside the furnace can be broken up.

The helicoid ribs in the tuyere can curve in either direction and can be of different sizes. Furthermore, the number thereof can be varied.

It will be apparent that I have provided a tuyere having a number of advantages. Some of the important advantages have been discussed and others will be apparent.

Having thus'described my invention, what 1' claim is:

1. A tuyere comprising a body portion having a bore extending therethrough, a series of helicoid ribs projecting radially inwardly from the surface of said bore and extending a portion of the length of the bore, and a second series of helicoid ribs projecting radially inwardly from the surface of said bore and extending along-a portion of the length of the here, said ribs or the first series being staggered relative to the ribs of the second series so as to provide clear paths longitudinally of said surface of the bore to facilitate cleaning by means of a bar or the like inserted in the bore and passed along such surwas face substantially in the same plane as the axis of the bore.

2. A blast furnace tuyere comprising a body having ,a bore of circular cross-section with a surface tapering inwardly towards the axis of the body from the inlet end to the outlet end, a series of helicoid ribs projecting inwardly from the surface of said bore and extending from a point adjacent the inlet end to a point intermediate the length of the bore, said ribs being spaced from each other circumferentially of the bore, and a second series of helicoid ribs projecting inwardly from the surface of said bore and extending from a point adjacent the inner ends or the ribs of the first series to a point adjacent the outlet end of the bore, said ribs of the second series being spaced from each other circumferentially of the bore and being staggered relative to the ribs of the first series so as to provide clear paths longitudinally of said surface of the bore to facilitate cleaning by means of a bar or the like inserted in the bore and passed along such surface substantially in the same plane as the axis of the bore.

3. A tuyere according to claim 2 wherein straight blade sections are provided on the first series of ribs at the inlet end of. the bore.

4. A tuyere according to claim 2 wherein the helicoid ribs of both series have one-eighth of a turn.

f 5. A tuyere according to claim 2 wherein the helicoid ribs of both series have one-eighth of a turn and are twisted about their own axes.

JOHN H. SPROW.

REFERENCES crrnn The following references are of record in the file of this patent:

UNITED STATES PATENTS 

